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Other Financial Data - (Other Current Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Premium finance advances and loans | $ 305.1 | $ 316.2
Accrued supplemental, direct bill and other receivables | 306.3 | 348.2
Refined coal production related receivables | 114.0 | 160.2
Deferred contract costs | 55.1 | 91.6
Prepaid expenses | 95.0 | 108.2
Total other current assets | $ 875.5 | $ 1,024.4

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